OPK help

Lori • Mom of 3 girls 🥰 Should I have one more? 😍
What time of day is the best time to test? FMU or in the afternoon? Or something else? This month I just keep getting a faint second line. What does that mean? Glow says I ovulate today but I've run out of tests.. So I have to go out and get more. Will it be ok to not test with FMU? Thank you :))